Characteristics of the Disturbance-Output Transfer Function for Sheet Process Control Systems Employing Scanning Gauges

This paper is concerned with an investigation of the effects of scan speed and other system parameters on the disturbance-output transfer function for sheet process control systems employing scanning gauges. The shape of the transfer function points out the presence of an important system design parameter, the cross-over period, which effectively determines which disturbance frequencies the control system is capable of controlling against. A simple approximate expression for the dependence of this parameter on scan speed and other system parameters is developed, and its accuracy is estimated with the use of a digital simulation.